Não informado. (1949). Mining transactions. American Institute of Mining, Metallurgical and Petroleum Engineers.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিNão informado. Mining Transactions. New York: American Institute of Mining, Metallurgical and Petroleum Engineers, 1949.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিNão informado. Mining Transactions. American Institute of Mining, Metallurgical and Petroleum Engineers, 1949.
সতর্কবাণী: সাইটেশন সবসময় 100% নির্ভুল হতে পারে না.